256619479 has 2 divisors, whose sum is σ = 256619480. Its totient is φ = 256619478.

The previous prime is 256619459. The next prime is 256619501. The reversal of 256619479 is 974916652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256619479 - 2¹³ = 256611287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256619459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128309739 + 128309740.

It is an arithmetic number, because the mean of its divisors is an integer number (128309740).

Almost surely, 2^256619479 is an apocalyptic number.

256619479 is a deficient number, since it is larger than the sum of its proper divisors (1).

256619479 is an equidigital number, since it uses as much as digits as its factorization.

256619479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 256619479 is about 16019.3470216485. The cubic root of 256619479 is about 635.4721757291.

The spelling of 256619479 in words is "two hundred fifty-six million, six hundred nineteen thousand, four hundred seventy-nine".